1. A combining form or prefix meaning relating to the number four, as in tetrabasic, tetrapetalous.

2. <chemistry> A combining form (also used adjectively) denoting four proportional or combining parts of the substance or ingredient denoted by the term to which it is prefixed, as in tetra-chloride, tetroxide.

Origin: Gr. tetra-, from tesares, tettares, four.

(05 Feb 2009)

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